Stereoselective Synthesis of 2H-Chromans by Reductive Deoxygenation of Differently Substituted 2-Sulfinylmethylchroman-2-ols
作者:Gloria Hernández-Torres、M. Carmen Carreño、Antonio Urbano、Françoise Colobert
DOI:10.1002/ejoc.201100436
日期:2011.7
Good-to-excellent diastereoselectivies have been achieved in the synthesis of 2H-chromans by Et3SiH/TMSOTf reductive deoxygenation of differently substituted 2-sulfinylmethylchroman-2-ols and their methyl ketals. The influence of both electron-donating and -withdrawing substituents on the sulfoxide and on the aromatic dihydobenzopyran core has been studied. SOR1 electron-donating groups (R1 = pMeOPh
通过 Et3SiH/TMSOTf 对不同取代的 2-亚磺酰基甲基色满-2-醇及其甲基缩酮进行还原脱氧,合成 2H-色满已实现了良好到优异的非对映选择性。已经研究了给电子和吸电子取代基对亚砜和芳族二氢苯并吡喃核的影响。SOR1 给电子基团(R1 = pMeOPh 和 2-MeO-1-萘基)导致亚砜被还原的竞争反应,从而降低了亚磺酰基 2H-色满的产率。该方法允许在芳族二氢苯并吡喃单元上存在不同的基团。使用 2-[(p-tolylsulfinyl)methyl] chroman-2-ols 获得了产率和非对映选择性方面的最佳结果。所有结果都基于机械原理进行了解释。